I'm looking to stream Riven and in order to do so I have to be able to play it in a window. Is there any way I can manage this? I've tried everything I can think of so far from Alt-Enter to trying to find specific software to do so, but no luck. Any suggestions?

DxWnd is a tool to run fullscreen DirectX games in a window. Not sure about its compatibility with streaming software, though.

You can play it in a windows with ScummVM (experimental build only).
But the support is, at the moment, experimental.

LGDN

I know this thread was from ages ago, but in case anyone else is looking for the answer to it: load up the game (running in ScummVM), then use alt-enter. Use ctrl-alt-+ to make the window bigger if you find it too small.